Walsh-Hadamard transform （WriT） can solve linear error equations on Field F2, and the method can be used to recover the parameters of convolutional code. However, solving the equations with many unknowns needs enorm...Walsh-Hadamard transform （WriT） can solve linear error equations on Field F2, and the method can be used to recover the parameters of convolutional code. However, solving the equations with many unknowns needs enormous computer memory which limits the application of WriT. In order to solve this problem, a method based on segmented WriT is proposed in this paper. The coefficient vector of high dimension is reshaped and two vectors of lower dimension are obtained. Then the WriT is operated and the requirement for computer memory is much reduced. The code rate and the constraint length of convolutional code are detected from the Walsh spectrum. And the check vector is recovered from the peak position. The validity of the method is verified by the simulation result, and the performance is proved to be optimal.展开更多
针对现有编码调制的典型多输入-多输出天波超视距雷达(MIMO-OTHR)波形实际上不严格正交,仅仅依靠降低波形间互相关性来提高波形准正交性能的情况,提出一种改进的基于Walsh矩阵的慢时间随机相位编码(Slow Time Random Phase-Coded,STRPC...针对现有编码调制的典型多输入-多输出天波超视距雷达(MIMO-OTHR)波形实际上不严格正交,仅仅依靠降低波形间互相关性来提高波形准正交性能的情况,提出一种改进的基于Walsh矩阵的慢时间随机相位编码(Slow Time Random Phase-Coded,STRPC)波形,以提高编码波形的正交性能,进而提高雷达系统的目标检测能力;同时,为解决Walsh矩阵编码的STRPC波形自相关性能不够好的问题,采用MIMO-OTHR失配滤波方法,以一定的失配滤波损失,进一步改善脉压主副瓣比.理论分析与仿真结果验证了Walsh矩阵编码对改善STRPC波形正交性的有效性.展开更多
基金supported by the National Natural Science Foundation of China(61072120)
文摘Walsh-Hadamard transform （WriT） can solve linear error equations on Field F2, and the method can be used to recover the parameters of convolutional code. However, solving the equations with many unknowns needs enormous computer memory which limits the application of WriT. In order to solve this problem, a method based on segmented WriT is proposed in this paper. The coefficient vector of high dimension is reshaped and two vectors of lower dimension are obtained. Then the WriT is operated and the requirement for computer memory is much reduced. The code rate and the constraint length of convolutional code are detected from the Walsh spectrum. And the check vector is recovered from the peak position. The validity of the method is verified by the simulation result, and the performance is proved to be optimal.
文摘针对现有编码调制的典型多输入-多输出天波超视距雷达(MIMO-OTHR)波形实际上不严格正交,仅仅依靠降低波形间互相关性来提高波形准正交性能的情况,提出一种改进的基于Walsh矩阵的慢时间随机相位编码(Slow Time Random Phase-Coded,STRPC)波形,以提高编码波形的正交性能,进而提高雷达系统的目标检测能力;同时,为解决Walsh矩阵编码的STRPC波形自相关性能不够好的问题,采用MIMO-OTHR失配滤波方法,以一定的失配滤波损失,进一步改善脉压主副瓣比.理论分析与仿真结果验证了Walsh矩阵编码对改善STRPC波形正交性的有效性.
